SQLPedia: agosto 2011

sábado, 20 de agosto de 2011

Screencast sobre SQL Server Denali Developer Tools Juneau

Les comparto este screencast en el cual vemos una instroducción a las herramientas de desarrollo en SQL Server Denali http://www.youtube.com/watch?v=-wBx2PnF74E

Saludos,

Ing. Eduardo Castro Martínez, PhD – Microsoft SQL Server MVP

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sábado, 13 de agosto de 2011

Wait Stats in SQL Server

When you are optimizing a SQL Server installation you must look at the Wait Stats in SQL Server and the easier way to check them is using the following DMVs sys.dm_os_waiting_tasks, sys.dm_exec_requests and sys.dm_os_wait_stats.

The sys.dm_os_wait_stats contains aggregated information about wait statistics for SQL Server, you must be aware that these wait statistics are aggregated at the server level, and there is no detail level available in this DMV. The following scripts queries this DMV.

SELECT *
FROM sys.dm_os_wait_stats
ORDER BY wait_time_ms DESC

The previous query returns the all waits with an accumulated wait time expressed in milliseconds. Because these wait stats are cumulative since the SQL Server service started to run, one way to clear these counters is to execute the DBCC SQLPERF(“sys.dm_os_wait_stats”,CLEAR) and from this point SQL Server begins to accumulate the wait stats again.

Best Regards,

Eduardo Castro

Microsoft SQL Server MVP

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